[poppler] [RFC] Replace GooHash by std::unordered_map
Adam Reichold
adam.reichold at t-online.de
Tue Feb 20 08:35:52 UTC 2018
Hello again again,
I obviously forgot the attachments to the previous mail. Doh...
Regards, Adam.
Am 20.02.2018 um 08:58 schrieb Adam Reichold:
> Hello again,
>
> Am 18.02.2018 um 23:23 schrieb Adam Reichold:
>>
>>
>> Am 18.02.2018 um 23:08 schrieb Albert Astals Cid:
>>> El diumenge, 18 de febrer de 2018, a les 16:55:37 CET, Adam Reichold va
>>> escriure:
>>>> Hello,
>>>>
>>>> the attached patch replaced Poppler's internal hash table implementation
>>>> GooHash by std::unordered_map found in the C++ standard library since
>>>> C++11. This continues Poppler's slow drift towards standard library
>>>> containers and removes one of the home-grown data structures with the
>>>> main goals of reducing code size and improving the long term
>>>> maintainability of the code base.
>>>
>>> Do you have any benchmarks on "rendering" speed and code size?
>>
>> Sorry, not at hand. I will try to prepare them during the week.
>
> I did run Splash rendering benchmarks of this branch against master with
> the result of rendering the circa 2400 documents of the TeXLive
> documentation present on my machine being:
>
> Cumulative run time:
> Result: 90.95 min ∓ 1.1 %
> Reference: 91.57 min ∓ 1.2 %
> Deviation: -0.0 %
> Cumulative memory usage:
> Result: 37.2 MB ∓ 0.7 %
> Reference: 37.0 MB ∓ 0.7 %
> Deviation: +0.0 %
>
> (Where result is this patch and the reference is master.) (The
> measurement was taken using the perftest script which I proposed here
> some time ago for which I'll attach the patch again for reproduceability.)
>
> I'll also attach the detailed comparison, but the gist seems to be that
> if there are significant changes, the run time is reduced but the memory
> usage is increased in the majority of cases. But this does not seem to
> show up in the cumulative results.
>
> Best regards, Adam.
>
> P.S.: One could try to improve the memory usage by tuning the load
> factor or calling shrink_to_fit where appropriate. Would you like me to
> try to do this?
>
> P.P.S.: One obvious area for improvement would be better
> interoperability between GooString and std::string, i.e. not converting
> them as C strings so that the length information does not need to be
> recomputed. I will try to prepare this as a separate patch on top of
> this one or should I include this here?
>
> Best regards, Adam.
>
>> Concerning code size, a release build of libpoppler.so goes from
>>
>> text data bss dec hex filename
>> 2464034 288852 360 2753246 2a02de libpoppler.so.73.0.0
>>
>> for the current master to
>>
>> text data bss dec hex filename
>> 2482129 288756 360 2771245 2a492d libpoppler.so.73.0.0
>>
>> with the patch applied, i.e. a 0.65% increase in binary size.
>>
>>
>> Please note that in my original message, I was referring only to source
>> code size, i.e.
>>
>> git diff --stat master...remove-goo-hash
>> 18 files changed, 168 insertions(+), 803 deletions(-)
>>
>>> Cheers,
>>> Albert
>>
>> Best regards, Adam.
>>
>>>>
>>>> Best regards, Adam.
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> poppler mailing list
>>> poppler at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/poppler
>>>
>>
>>
>>
>> _______________________________________________
>> poppler mailing list
>> poppler at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/poppler
>>
>
>
>
> _______________________________________________
> poppler mailing list
> poppler at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/poppler
>
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Cumulative memory usage:
Result: 37.2 MB ∓ 0.7 %
Reference: 37.0 MB ∓ 0.7 %
Deviation: +0.0 %
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